From: Eric Dumazet <edumazet@google.com>
Date: Mon, 22 Jan 2024 11:26:02 +0000 (+0000)
Subject: sock_diag: remove sock_diag_mutex
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f44e64990beb41167bd7c313d90bcf7e290c3582;p=linux.git

sock_diag: remove sock_diag_mutex

sock_diag_rcv() is still serializing its operations using
a mutex, for no good reason.

This came with commit 0a9c73014415 ("[INET_DIAG]: Fix oops
in netlink_rcv_skb"), but the root cause has been fixed
with commit cd40b7d3983c ("[NET]: make netlink user -> kernel
interface synchronious")

Remove this mutex to let multiple threads run concurrently.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---

diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index 5c3666431df49..6541228380252 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -292,13 +292,9 @@ static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	}
 }
 
-static DEFINE_MUTEX(sock_diag_mutex);
-
 static void sock_diag_rcv(struct sk_buff *skb)
 {
-	mutex_lock(&sock_diag_mutex);
 	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
-	mutex_unlock(&sock_diag_mutex);
 }
 
 static int sock_diag_bind(struct net *net, int group)